fix: quick clicking on close button triggers double-click close command

Since the close button is a child element of the page tab, quickly clicking the close button can trigger `HandleDoubleClick`, leading to incorrect command execution. The correct behavior should be to revert to the browser's original operation behavior. This commit adds a rough `IsOnCloseButton` check, which simply traverses push buttons and checks if the mouse is over it. It cannot be used alone to accurately identify the close button, so it is recommended to call it in conjunction with `IsOnOneTab`.

src/iaccessible.h

@@ -514,4 +514,24 @@ bool IsOnDialog(HWND hwnd, POINT pt) {
   return flag;
 }
 
+// Whether the mouse is on the close button of a tab.
+// Should be used together with `IsOnOneTab` to search the close button.
+bool IsOnCloseButton(NodePtr top, POINT pt) {
+  bool flag = false;
+  TraversalAccessible(
+      top,
+      [&pt, &flag](NodePtr child) {
+        if (GetAccessibleRole(child) == ROLE_SYSTEM_PUSHBUTTON) {
+          GetAccessibleSize(child, [&pt, &flag](RECT rect) {
+            if (PtInRect(&rect, pt)) {
+              flag = true;
+            }
+          });
+        }
+        return flag;
+      },
+      true);  // raw_traversal
+  return flag;
+}
+
 #endif  // IACCESSIBLE_H_

src/tabbookmark.h

@@ -123,18 +123,18 @@ int HandleDoubleClick(WPARAM wParam, PMOUSEHOOKSTRUCT pmouse) {
   }
 
   bool is_on_one_tab = IsOnOneTab(top_container_view, pmouse->pt);
+  bool is_on_close_button = IsOnCloseButton(top_container_view, pmouse->pt);
   bool is_only_one_tab = IsOnlyOneTab(top_container_view);
-
-  if (is_on_one_tab) {
-    if (is_only_one_tab) {
-      ExecuteCommand(IDC_NEW_TAB, hwnd);
-      ExecuteCommand(IDC_WINDOW_CLOSE_OTHER_TABS, hwnd);
-    } else {
-      ExecuteCommand(IDC_CLOSE_TAB, hwnd);
-    }
-    return 1;
+  if (!is_on_one_tab || is_on_close_button) {
+    return 0;
   }
-  return 0;
+  if (is_only_one_tab) {
+    ExecuteCommand(IDC_NEW_TAB, hwnd);
+    ExecuteCommand(IDC_WINDOW_CLOSE_OTHER_TABS, hwnd);
+  } else {
+    ExecuteCommand(IDC_CLOSE_TAB, hwnd);
+  }
+  return 1;
 }
 
 // Right-click to close tab (Hold Shift to show the original menu).